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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Wheel Calculator Question



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      07-12-2013, 07:34 AM   #1
WiscoE90
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Wheel Calculator Question

I have been using the wheel calculator up top^

For a "square" setup, they say do not go more than 1% difference or 0.5% difference. ***1st question is that one percent difference that is displayed in the box? or is that 1% difference to the front wheels? EXAMPLE: Calculate the front at 0.906% difference and the rears at 0.20% difference -++- Front to rear that would be 0.062%... BUT they both are over 1% from ORIGINAL if you add them... are they separate calculations?***

My question and sorry if I am over analyzing it...

My stocks are the P225/45/R17 8inch wide +34
looks like this below...

Lets say I want to run the following...

19x8.5 ~ 225/35/R19 ===+=== 0.906% New Tires Dia: 25.2
19x10 ~ 255/30/R19 ===+=== 0.205% New Tires Dia: 25.02

OR difference of % change NEW from front to rear is 0.712%.... (which is below 1%)

I am WAY over analyzing I have heard how important it is to run a square setup...

Little help!


Or can someone give me a /
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      07-12-2013, 08:11 AM   #2
MonacoBlueE90
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You need to compare your new front and rear tyres to each other.
It doesn't matter what you used before.
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      07-12-2013, 12:31 PM   #3
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Stay within 1% of the front and rear wheels, as in, the new setup needs to be within 1%. Both front and rear wheels may end up being slightly taller, or shorter, but as long as they're within spec you won't have a problem running staggered wheels and tires.
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